This version of windows usually comes with the touchpad version of microsoft laptops. They have a special version of adobe reader that is built for touch related operations.
This version of adobe acrobat, even though it is the default pdf app does not work with inTennis.
inTennis will be unable to print an invoice with the usual error no app specified for opening pdf.
Solution is to uninstall the existing adobe reader and install any adobe reader from the internet.